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Title: Novel diamond cells for neutron diffraction using multi-carat CVD anvils

Authors:
; ; ORCiD logo
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1393658
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 88; Journal Issue: 8
Country of Publication:
United States
Language:
ENGLISH

Citation Formats

Boehler, R., Molaison, J. J., and Haberl, B. Novel diamond cells for neutron diffraction using multi-carat CVD anvils. United States: N. p., 2017. Web. doi:10.1063/1.4997265.
Boehler, R., Molaison, J. J., & Haberl, B. Novel diamond cells for neutron diffraction using multi-carat CVD anvils. United States. doi:10.1063/1.4997265.
Boehler, R., Molaison, J. J., and Haberl, B. 2017. "Novel diamond cells for neutron diffraction using multi-carat CVD anvils". United States. doi:10.1063/1.4997265.
@article{osti_1393658,
title = {Novel diamond cells for neutron diffraction using multi-carat CVD anvils},
author = {Boehler, R. and Molaison, J. J. and Haberl, B.},
abstractNote = {},
doi = {10.1063/1.4997265},
journal = {Review of Scientific Instruments},
number = 8,
volume = 88,
place = {United States},
year = 2017,
month = 8
}
  • Cited by 1
  • Traditionally, neutron diffraction at high pressure has been severely limited in pressure because low neutron flux required large sample volumes and therefore large volume presses. At the high-flux Spallation Neutron Source at the Oak Ridge National Laboratory, we have developed in this paper new, large-volume diamond anvil cells for neutron diffraction. The main features of these cells are multi-carat, single crystal chemical vapor deposition diamonds, very large diffraction apertures, and gas membranes to accommodate pressure stability, especially upon cooling. A new cell has been tested for diffraction up to 40 GPa with an unprecedented sample volume of ~0.15 mm 3.more » High quality spectra were obtained in 1 h for crystalline Ni and in ~8 h for disordered glassy carbon. Finally, these new techniques will open the way for routine megabar neutron diffraction experiments.« less
    Cited by 1
  • Cited by 1
  • The melting curve of silicon has been determined up to 15 GPa using a miniaturized Kawai-type apparatus with second-stage cubic anvils made of X-ray transparent sintered diamond. Our results are in good agreement with the melting curve determined by electrical resistivity measurements [V.V. Brazhkin, A.G. Lyapin, S.V. Popova, R.N. Voloshin, Nonequilibrium phase transitions and amorphization in Si, Si/GaAs, Ge, and Ge/GaSb at the decompression of high-pressure phases, Phys. Rev. B 51 (1995) 7549] up to the phase I (diamond structure)-phase II ({beta}-tin structure)-liquid triple point. The triple point of phase XI (orthorhombic, Imma)-phase V (simple hexagonal)-liquid has been constrained tomore » be at 14.4(4) GPa and 1010(5) K. These results demonstrate that the combination of X-ray transparent anvils and monochromatic diffraction with area detectors offers a reliable technique to detect melting at high pressures in the multianvil press.« less
  • We investigated phase relations in pyrolite at -33--40 GPa and -1800--2150 K by in situ X-ray diffraction using Kawai-type apparatus with sintered diamond anvils. The results demonstrated that MgSiO{sub 3}-rich orthorhombic perovskite (mpv), CaSiO{sub 3}-rich cubic perovskite (cpv) and (Mg,Fe)O ferropericlase (fp) are the stable phases in pyrolite bulk composition at the conditions corresponding to the lower mantle. However, chemical analyses of a run product recovered from -34 GPa by an analytical transmission electron microscope showed the coexistence of metallic iron particles with mpv, fp, and SiO{sub 2}-rich amorphous phase. Also, Fe/Mg partitioning coefficient between mpv and fp was foundmore » to be 0.66(31), which is consistent with previous results for pyrolite bulk composition at 26--30 GPa and -1900 K. These results indicate that iron-rich metallic particles can exist in the lower mantle as a stable phase to the depth of at least -900 km.« less